Metroline Security use our extensive experience to design and install the correct fire alarm system for your premises.
There are different categories of protection within BS5839 Part 1, 2002. Metroline Security will, if necessary, consult with Building Control Officers and the Local Fire Authority to ensure that the correct system is specified.
The objective of property protection is to ensure that the fire brigade are alerted in the very early stages of a fire.
Type P1: Property protection with automatic detection installed throughout the building.
Type P2: Property protection with automatic detection in designated areas.
The objective of life protection is to protect people from loss or life or injury as a result of fire.
Type M: Manual system with call points.
Type L5: Life safety generally when specific fire engineering solution or where P1 insurance is required.
Type L4: Life safety system, typically a manual system plus smoke detection on the escape route.
Type L3: Life safety system, typically a manual system plus smoke detection on the escape route and heat or smoke detectors in adjacent rooms.
Type L2: Life safety system, same as L3 but detection in fire hazard/risk of ignition such as kitchen, sleeping areas or other designated areas.
Type L1: Life safety similar, as per P1 but where audibility is more critical.
There are a variety of different smoke detectors which are identified below:
Optical smoke detectors operate by using infra red light refracting off any smoke particles to trigger the alarm. As a result, optical smoke detectors are more sensitive to smouldering fire often resulting from modern fabrics and furnishings. Unfortunately optical detectors are more prone to false alarms from steam or particularly dusty environments, meaning that they unsuitable for outside bathroom, where building works are taking place, etc).
Beam detectors are made up of a transmitter and receiver – the transmitter sends an infra red beam to the RX (receiver). If this beam is in any way obscured then this is detected and the alarm triggered.
Ionisation detectors work on the principal or charred smoke particles causing a small current flow as they pass between two electrodes. Ionisation detectors are therefore more suitable for fire which are rapidly spread, such as paper and wood. Unfortunately they are more prone to false alarms from burning smells which makes them unsuitable outside a kitchen.
Heat detectors comes into two main categories, rate of rise and fixed temperature.
Rate of rise heat detectors respond to a sudden increase in temperature but also contain a fixed element in case of a slow smouldering fire. This makes them most suitable for areas where a smoke detector is undesirable.
Fixed temperature hear detectors have a sensing element which operate the detector when a fixed temperature is reached. These make them ideal for use in kitchens, boiler room, etc where a rate of rise detector would be unsuitable.